What is the meaning of condensation?

noun

• Psychoanalysis) an unconscious process whereby two ideas or images combine into a single symbol; especially in dreams. (
• The process of changing from a gaseous to a liquid or solid state.
• Atmospheric moisture that has condensed because of cold.
  • synonyms: condensate
• The process or result of becoming smaller or pressed together.
  • usage: "the contraction of a gas on cooling"
  • synonyms: compression, contraction
• A shortened version of a written work.
  • synonyms: abridgement, abridgment, capsule
• The act of increasing the density of something.
  • synonyms: condensing